*{ 
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{ 
    background-color: #031321;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

a{ 
    position: relative;
    display: inline-block;
    padding: 15px 30px;
    color: #2196f3;
    text-decoration: none;
    text-transform: uppercase;
    font-size: 24px;
    letter-spacing: 4px;
    overflow: hidden;
    transition: 1s;
}

a:hover{ 
    color: #255784;
    background-color: #2196f3;
    box-shadow: 0 0 80px #2196f3, 0 0 40px #2196f3, 0 0 10px #2196f3;
    transition-delay: 1s;
    margin-left: 20px;
}

span:nth-child(1){ 
    height: 2px;
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    background: linear-gradient(90deg, transparent, #2196f3);
}

a:hover span:nth-child(1){ 
    left: 100%;
    transition: 0.8s;
}
span:nth-child(2){ 
    position: absolute;
    top: -100%;
    width: 2px;
    height: 100%;
    right: 0;
    background: linear-gradient(180deg, transparent, #2196f3);
}

a:hover span:nth-child(2){ 
    top: 100%;
    transition: 0.8s;
    transition-delay: 0.25s;
}
span:nth-child(3){ 
    height: 2px;
    position: absolute;
    bottom: 0;
    left: 100%;
    width: 100%;
    background: linear-gradient(270deg, transparent, #2196f3);
}

a:hover span:nth-child(3){ 
    left: -100%;
    transition: 0.8s;
    transition-delay: 0.5s;
}
span:nth-child(4){ 
    position: absolute;
    top: 100%;
    width: 2px;
    height: 100%;
    left: 0;
    background: linear-gradient(0deg, transparent, #2196f3);
}

a:hover span:nth-child(4){ 
    top: -100%;
    transition: 0.8s;
    transition-delay: 0.75s;
}
